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Hu Y.-J.,Communications Equipment Repair Institute | Qiu Z.-M.,Communications Equipment Repair Institute | Yang B.,Communications Equipment Repair Institute | Shi S.-J.,PLA University of Science and Technology | Yang J.-J.,Communications Equipment Repair Institute
IEEE Antennas and Wireless Propagation Letters | Year: 2015

This letter presents a novel compact wideband circularly polarized antenna by utilizing Vivaldi antenna structure as the design concept. The proposed antenna consists of four exponentially tapered patches, a circular metal wall and a feed network. Four tapered patches are sequentially rotated and vertically located in the circular metal wall which acts as a vertical ground plane. Slot-coupled feed technique is applied to feed the antenna. Feeding by a corporate feed network, wide impedance bandwidth and axial ratio bandwidth are achieved. Parametric studies are made to optimize the antenna. The experimental results show that the antenna exhibits a 3-dB AR bandwidth of 41.4% (3.45-5.25 GHz) and a 10-dB impedance bandwidth of 57.3% (3.06-5.52 GHz). © 2002-2011 IEEE.

Hu Y.-J.,Communications Equipment Repair Institute | Ding W.-P.,PLA University of Science and Technology | Qu D.-X.,PLA University of Science and Technology | Cao W.-Q.,PLA University of Science and Technology | Luo K.,PLA University of Science and Technology
Frequenz | Year: 2014

A wideband circularly polarized (CP) slot antenna array is presented by employing cavity-backed CP multi-feed slot antenna as the element. The antenna element consists of four microstrip-fed circular stubs that excite the circular slot to generate circular polarization, a circular back cavity and a separate corporate feed network layer. The measured 3-dB axial-ratio (AR) bandwidth of the element is 38.6% (4.6-6.8 GHz) in which the reflection coefficient (|S11|) is below-10 dB. The investigation is extended to a 2×2 antenna array by using sequentially rotated technique. Wilkinson power dividers are applied to design the feed network of the array. The fabricated antenna array can provide a 1-dB AR bandwidth of 55.7% (4.4-7.8 GHz). In the 1-dB AR bandwidth, the |S11| is below-10 dB and the gain is more than 10.0 dBic. The 3-dB gain bandwidth is about 40.0% (4.8-7.2 GHz) with the maximum gain 15.1 dBic. © 2014 by Walter de Gruyter Berlin/Boston.

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